If your vCenter is on a Windows host, then you must use Windows commands to restart the VMware vSphere web client service in vCenter. There are many ways to restart services in vcenter and troubleshooting purposes, it is required to restart the VMware vCenter Server services such as VMware Virtual Center Server, VMware vSphere Web Client, or VMware Directory Service.

VMware vCenter Server 6.x, VMware recommends to use the vSphere Web Client or Service Control command-line tool to stop, start, or restart vCenter Server. These commands are verified with VMware vCenter Server 6.x and steps to restarting the vSphere web client service in Windows.

How to stop, start and status vCenter services command in Windows server.

1. Log in as an administrator to the windows server that is running vCenter Server.

2. Open an administrative command prompt.
Run this command to change to vCenter Server and/or Platform Services Controller installation directory: